ORGANIC ELECTROLUMINESCENCE DISPLAY DEVICE

Abstract

An organic electroluminescence display device is disclosed wherein plural organic electroluminescence elements each having an anode, a cathode and an organic layer sandwiched in between the anode and the cathode, the plural organic electroluminescence elements including organic electroluminescence elements developing different colors in a row direction, and at least one of the organic layers having an outer edge of a conic section at an end portion in a column direction thereof, the outer edge of the conic section becoming narrower gradually in its width in a row direction of vapor deposition thereof toward an extreme end at an end portion in a column direction thereof. The organic electroluminescence display device can improve the vapor deposition accuracy and the degree of design freedom.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram showing an end portion in a column direction of a conventional vapor deposition mask;

FIG. 2 is a diagram showing an end portion in a column direction of a vapor deposition mask according to the present invention;

FIG. 3 is a planar pattern of an organic layer vapor-deposited using the vapor deposition mask shown in FIG. 2;

FIG. 4 is a sectional view of a cathode contact portion of an active matrix substrate in a conventional organic EL display device;

FIG. 5 is a sectional view of a cathode contact portion of an active matrix substrate in an organic EL display device according to a second embodiment of the present invention;

FIG. 6 is a diagram showing a vapor deposition area of an organic EL display device according to a third embodiment of the present invention;

FIG. 7 is an enlarged diagram of a circular area (a left upper end portion of a pixel area) shown in FIG. 6;

FIG. 8 is a diagram showing a vapor deposition area of an organic EL display device according to a fourth embodiment of the present invention;

FIG. 9 is a diagram showing a vapor deposition area of an organic EL display device according to a fifth embodiment of the present invention; and

FIG. 10 is a diagram showing a vapor deposition area of an organic EL display device according to a sixth embodiment of the present invention.

Claims

1. An organic electroluminescence display device comprising a plurality of organic electroluminescence elements each having an anode, a cathode and an organic layer sandwiched in between the anode and the cathode, the plurality of organic electroluminescence elements being arranged in a matrix shape, wherein: the plural organic electroluminescence elements include organic electroluminescence elements developing different colors in a row direction; andat least one of the organic layers becomes narrower gradually in its width in a row direction of vapor deposition thereof toward an extreme end at an end portion in a column direction thereof.

2. An organic electroluminescence display device comprising a plurality of organic electroluminescence elements each having an anode, a cathode and an organic layer sandwiched in between the anode and the cathode, the plurality of organic electroluminescence elements being arranged in a matrix shape, wherein: the plural organic electroluminescence elements include organic electroluminescence elements developing different colors in a row direction; andan outer edge of at least one of the organic layers is constituted by a differentiable curved line at an end portion in a column direction thereof.

3. An organic electroluminescence display device comprising a plurality of organic electroluminescence elements each having an anode, a cathode and an organic layer sandwiched in between the anode and the cathode, the plurality of organic electroluminescence elements being arranged in a matrix shape, wherein: the plural organic electroluminescence elements include organic electroluminescence elements developing different colors in a row direction; andan outer edge of at least one of the organic layer is constituted by an outwardly expanded curved line at an end portion in a column direction thereof.

4. The organic electroluminescence display device according to claim 1, wherein the curved line is a curved line capable of being approximated to a conic section or a quadratic curve.

5. The organic electroluminescence display device according to claim 3, wherein the curved line is a curved line capable of being approximated to a part of an ellipse, a parabola, or a hyperbola.

6. An organic electroluminescence display device comprising a plurality of organic electroluminescence elements each having an anode, a cathode and an organic layer sandwiched in between the anode and the cathode, the plurality of organic electroluminescence elements being arranged in a matrix shape to form a display area, wherein: the cathode extends to the exterior of the display area and is supplied with cathode voltage through a plurality of contact holes; andthe organic layer is formed in a portion of the plural contact holes and under the cathode.

7. An organic electroluminescence display device comprising a plurality of organic electroluminescence elements each having an anode, a cathode and an organic layer sandwiched in between the anode and the cathode, the plurality of organic electroluminescence elements being arranged in a matrix shape to form a display area, wherein: the organic layer includes a hole injection layer, a hole transport layer, a luminescence layer and an electron transport layer;the cathode is formed in common to the plural organic electroluminescence elements;the cathode extends to the exterior of the display area and is supplied with cathode voltage through a plurality of contact holes; anda part of the organic layer is formed in a portion of the plural contact holes and under the cathode.

8. The organic electroluminescence display device according to claim 7, wherein the part of the organic layer comprises the hole injection layer and the hole transport layer.

9. The organic electroluminescence display device according to claim 7, wherein the part of the organic layer comprises the luminescence layer and the electron transport layer.

10. The organic electroluminescence display device according to claim 7, wherein the part of the organic layer is formed in the contact holes located near the display area out of the plural contact holes.